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Reduce ColorMap inefficiencies (#1927)

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* Avoid regenerating QColor lists, speed up generation where unavoidable

* whitespace and typo reduction
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Nils Nemitz 2021-07-30 12:50:10 +09:00 committed by GitHub
parent eb8965c2f4
commit 5084d9b537
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1 changed files with 11 additions and 4 deletions
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15
pyqtgraph/colormap.py
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@ -608,7 +608,7 @@ class ColorMap(object):
if np.isscalar(data): if np.isscalar(data):
return QtGui.QColor(*interp) return QtGui.QColor(*interp)
else: else:
return [QtGui.QColor(*x) for x in interp] return [QtGui.QColor(*x.tolist()) for x in interp]
else: else:
return interp return interp
@ -635,6 +635,9 @@ class ColorMap(object):
When no parameters are given for `p1` and `p2`, the gradient is mapped to the When no parameters are given for `p1` and `p2`, the gradient is mapped to the
`y` coordinates 0 to 1, unless the color map is defined for a more limited range. `y` coordinates 0 to 1, unless the color map is defined for a more limited range.
This is a somewhat expensive operation, and it is recommended to store and reuse the returned
gradient instead of repeatedly regenerating it.
Parameters Parameters
---------- ----------
@ -650,8 +653,7 @@ class ColorMap(object):
p2 = QtCore.QPointF(self.pos.max()-self.pos.min(),0) p2 = QtCore.QPointF(self.pos.max()-self.pos.min(),0)
grad = QtGui.QLinearGradient(p1, p2) grad = QtGui.QLinearGradient(p1, p2)
pos, color = self.getStops(mode=self.BYTE) pos, color = self.getStops(mode=self.QCOLOR)
color = [QtGui.QColor(*x) for x in color]
if self.mapping_mode == self.MIRROR: if self.mapping_mode == self.MIRROR:
pos_n = (1. - np.flip(pos)) / 2 pos_n = (1. - np.flip(pos)) / 2
col_n = np.flip( color, axis=0 ) col_n = np.flip( color, axis=0 )
@ -669,6 +671,8 @@ class ColorMap(object):
Returns a QBrush painting with the color map applied over the selected span of plot values. Returns a QBrush painting with the color map applied over the selected span of plot values.
When the mapping mode is set to `ColorMap.MIRROR`, the selected span includes the color map twice, When the mapping mode is set to `ColorMap.MIRROR`, the selected span includes the color map twice,
first in reversed order and then normal. first in reversed order and then normal.
It is recommended to store and reuse this gradient brush instead of regenerating it repeatedly.
Parameters Parameters
---------- ----------
@ -695,6 +699,9 @@ class ColorMap(object):
def getPen(self, span=(0.,1.), orientation='vertical', width=1.0): def getPen(self, span=(0.,1.), orientation='vertical', width=1.0):
""" """
Returns a QPen that draws according to the color map based on vertical or horizontal position. Returns a QPen that draws according to the color map based on vertical or horizontal position.
It is recommended to store and reuse this gradient pen instead of regenerating it repeatedly.
Parameters Parameters
---------- ----------
@ -756,7 +763,7 @@ class ColorMap(object):
elif mode == self.QCOLOR: elif mode == self.QCOLOR:
if color.dtype.kind == 'f': if color.dtype.kind == 'f':
color = (color*255).astype(np.ubyte) color = (color*255).astype(np.ubyte)
color = [QtGui.QColor(*x) for x in color] color = [QtGui.QColor(*x.tolist()) for x in color]
self.stopsCache[mode] = (self.pos, color) self.stopsCache[mode] = (self.pos, color)
return self.stopsCache[mode] return self.stopsCache[mode]